Use the decoy structure to guide others toward better options

If you’re structuring choices for a team or organization, include a dominated option to help people recognize and choose the best option.

Why it works

The decoy effect is not only a manipulation tool — it can be used constructively. When a decision-maker (team lead, planner, product designer) knows which option is genuinely best and wants to help others see it, adding an option that is clearly inferior to the best option (but not to the mediocre alternative) can highlight the best option’s superiority. This is a nudge rather than a manipulation because the best option is, in fact, best — the decoy just makes the advantage salient rather than obscured by information overload.

How to do it

1. Identify the genuinely best option for the decision your group faces.
2. Design a "comparison anchor" option that is visibly worse than the best option on the dimensions that matter, but comparable to the alternatives.
3. Present this alongside the real options; the best option will stand out relative to the anchor.
4. Be prepared to be transparent about the structure if asked — this approach is defensible because it serves the group’s actual interests.

Evidence

The asymmetric dominance effect is robust enough that it is used deliberately in choice architecture (Thaler & Sunstein’s nudge work). Its ethical use in helping people identify a genuinely better option is supported by the nudge literature on transparency and legitimacy. (observational)

The line between helpful nudge and manipulation is whether the structurer’s interests and the chooser’s interests are aligned. This practice is only ethical when the "best" option genuinely serves the chooser.

Sources

• Thaler & Sunstein (2008), Nudge: Improving Decisions about Health, Wealth, and Happiness

Common mistake

Using the decoy structure to guide people toward the option that benefits the structurer rather than the chooser — this crosses from nudge into manipulation.